Khmer people (ខ្មែរ, English pronunciation: /ˈkmɛər/ or /kəˈmɛər/) are the predominant ethnic group in Cambodia, accounting for approximately 90% of the 14.8 million people in the country. They speak the Khmer language, which is part of the larger Mon–Khmer language family found throughout Southeast Asia. The majority of the Khmer are followers of the Khmer style of Buddhism, a highly syncretic version which blends elements of Theravada Buddhism, Hinduism, animism and ancestor-spirit worship. Significant populations of Khmers reside in adjacent areas of Thailand (Northern Khmer) and the Mekong Delta region of neighboring Vietnam (Khmer Krom).

Migrations into the mainland regions of Southeast Asia from the north continued well into historic times.^{[citation needed]} Most scholars believe they came at least 3,000 years ago, much earlier than Tai people who now inhabit many parts of what was originally Austroasiatic territory. The reason they migrated into Southeast Asia is generally debated, but scholars believe that Mon–Khmer were pushed down by invading Sino-Tibetans from the north as evident by Austroasiatic vocabulary in Chinese or because of agricultural purposes as evident by their migration routes along major rivers. The Khmer are relatives to the Mon who settled further to the west.

Norodom Sihanouk (Khmer: នរោត្តម សីហនុ) (born 31 October 1922) was the King of Cambodia from 1941 to 1955 and again from 1993 until his semi-retirement and voluntary abdication on 7 October 2004 in favour of his son, the current King Norodom Sihamoni. Since his abdication, he has been known as The King-Father of Cambodia (Preahmâhaviraksat), a position in which he retains many of his former responsibilities as constitutional monarch.

The son of King Norodom Suramarit and Queen Sisowath Kossamak, Sihanouk has held so many positions since 1941 that the Guinness Book of World Records identifies him as the politician who has served the world's greatest variety of political offices. These included two terms as King, two as Sovereign Prince, one as president, two as prime minister, and one as Cambodia's non-titled head of state, as well as numerous positions as leader of various governments-in-exile.

Most of these positions were only honorific, including the last position as constitutional King of Cambodia. Sihanouk's actual period of effective rule over Cambodia was from 9 November 1953, when France granted independence to Cambodia, until 18 March 1970, when Lon Nol and the National Assembly deposed Sihanouk.

Hun Sen (Khmer: ហ៊ុន សែន; born 5 August 1952) is the current Prime Minister of Cambodia and leader of the Cambodian People's Party (CPP), which has governed Cambodia since the Vietnamese-backed overthrow of the Khmer Rouge in 1979. Since the restoration of multi-party democracy in 1993, the CPP has been in a coalition with the royalist Funcinpec party.

His current, full, honorary title is Samdech Akeak Moha Sena Padei Techo Hun Sen (Khmer: សម្តេចអគ្គមហាសេនាបតីតេជោ ហ៊ុន សែន). The title "Samdech" was attached to his name in 1993 by King Norodom Sihanouk. It is only an honorary title and does not give him further powers. He has a glass eye, the result of a wound sustained during the Khmer Rouge offensive against Phnom Penh in April 1975. Hun Sen is currently the longest serving leader in South East Asia and is one of the longest serving prime ministers in the world, having been in power through various coalitions since 1985.

Hun Sen came to power with the Khmer Rouge and served as a Battalion Commander in the Eastern Region of Democratic Kampuchea (previous name of Cambodia). After falling out with the Khmer Rouge Hun Sen fled to Vietnam. Hun Sen was selected by the Vietnamese for a leadership role in the rebel army and government they were creating for Cambodia. When the Khmer Rouge regime was overthrown, Hun Sen was appointed as Foreign Minister of the Vietnamese-installed People's Republic of Kampuchea/State of Cambodia (PRK/SOC) in 1979 and in 1985 he was made Chairman of the Council of Ministers and Prime Minister, after the death of Chairman Chan Sy until 1990, (with a brief interruption from 1986 until 1987). As Foreign Minister, Hun Sen was a key figure in the Paris Peace Talks, which brokered peace in Cambodia.

Sam Rainsy (Khmer: សម រង្ស៊ី IPA: [sɑːm reə̯̆ŋsiː]; born March 10, 1949) is a Cambodian politician.

Sam Rainsy was born in Phnom Penh in 1949. His father, Sam Sary was assassinated in 1959 when Sam Rainsy was ten, while his mother was thrown into prison. He moved to France in 1965, studied there and then worked as an investment manager and executive director in a variety of Parisian financial companies. He became a member of the Cambodian Funcinpec Party, and after returning to Cambodia in 1992 was elected a member of parliament for Siem Reap Province the following year. He became Minister of Finance, but was expelled from the party after losing a vote of no-confidence in 1994. In 1995, he founded the Khmer Nation Party (KNP), which changed its name before the 1998 elections to the Sam Rainsy Party (SRP) to avoid registration issues. [1] Sam was elected a member of parliament for Kompong Cham province in those elections, and the party polled 14% of the vote. In the 2003 elections, it polled 22% of the vote.